Moving on from the JD series, let's talk about the RD series. With the RD series, you get JL's NexD switching tech so you'll get the same well designed, compact circuit that lets the amp be smaller in size but produce the same power. Another feature that is similar to the JD series is the LED clipping indicators. Similarly to on the JD series, these are going to help you quickly and correctly set your gain to get great sound and bass from your subwoofer.